User blog:Boybunny6262/Anyone help me with stuff?

Hi i was wondering if anyone could help me on these things or decide

1. what is iv breeding and why does ivs matter

2. why does ev training matter (although i do EV train)

3. should you replace your starter

4.what are the odds of a HA

5.should i EV train my espeon in sp denfense

Plz help me i am a pretty much noob on pokemon although i have played games like S/M